Motion-picture-film-treating device



4Jlily 1, 1930.

J. W. DUNN 1,768,895

MOTION PICTURE FILM TREATING DEVICE File-d Nov. 5, 1928 2 Sheng-sheet 14 Ff/[gil [11 July 1, "1930, J. w. DUNN 1,768,895

lMOTION PICTURE FILM 'IREATING DEVICE vF'il'ed Nov. 5, 19.28 2Sheets-Sheet 2 o o o o dci'mgn: o

aged Big er mur/@ Patented July 1, 1930 UNITED STATES PATENT ori-*icaJOSEPH. W. DUNN, OF CHICAGO, ILLINOIS, ASSIGNOR OEMONE-HALF TO DANIEL.J

` LUBLINER, F CHICAGO, ILLINOIS i MOTI0N-PICTURE-FIIMTREATING l DEVICEkApplication inea 'November 5, 192s. serial No. 317,139.

This invention relates to a motion picture film treating device,l havingfor its object the provision of' ya device of the type indicated, ofcomparatively simple design and construction, positive'in ,operation andparticularly designed and adapted to wax the margins or" new films in aconvenient, practical manner. e

Another object is to provide la time and labor saving device for waxingnewflms pre# paratory to actual use in motion picture projAdditionalobjectsand advantagesvof the method and construction employedwill -appear` more fullyin thehereinafter described details, when takenin 'connetcion with thea@ companying drawingsinwhich v v Figure 1 is aplan view of the device;`

Fig. 2'is a sectional lview taken on line 2-2 of Fig. 1;

3 is a side elevation of the device as it appears in actual operation;

Fig. 4 is a transverse section taken on line 4h4 of Fig. 1;

Fig. 5 is a plan view of the bed plate;

6 is a plan view of the slidable block, and Fig. 7 is a plan view of thefixed block which cooperates with the slidable block.

In the drawings, 11 designates a 'base to which the standards 12,13having the similar film winding reels 14, 15 revolvably supportedthereon, are secured. The reels 14, 15 are of conventional pattern,operated by handles 16 having the usual back lash check consisting ofthe pawl 1'? and ratchet wheel18, these details in themselves beingconventional V1n the art and forming no part of my invention.

The device embodying my invention in its preferred form comprises aplate 19 adjustably supported on and secured to brackets 2() fastened tothe base 11. Slidably mounted on the plate 19 and guided between theintegral flanges 21 thereof is a block 22 having holes 23, 24 to receivethe bolts 25,126 respectively. The lower ends of the shanks of the bolts25, 26 pass through slots 27, 28 formed in the plate 19, the heads 26 ofthe bolts slidably contacting with the bottom of the plate. idling nuts29, 30 serve to clamp lthe block 22 to the plate in the positiondesired. A corresponding fixed block 31 isalso secured to the plate 19vby bolts'and nuts 32, 33. vIt

\ will be seen that I have provided the slidable and xed blocks withconcave edges 34, 35 hef.

tween which sections' of tallow or paraffin candles 36 are secured, theconcave edges being of an arcuate formation adapted topartiallyencirclethe candle sections 36 whereby the latter may befirmlyv held in position for the waxing of the film. The film 37 is ledfrom one of the winding reels 15 over aroller 38 having a guiding flange39 which serves to retain the film -in an even channel. `The roller38-is rotatably supported on brackets 40,v 41 by pins 42, 43 secured inthebody of the roller, the brackets being screw` fastened to the block22'. vAfter passing over the roller 38 the film is passed downwardlylunder the candle sections36 to engage the latterwith the margin of thefilm, as best shown in Fig, 1. Thefilm thence passes over the roller 44havo ing a guiding yand .retaining flange 45, Vthis' j latter rollerbeing pivoted bythe pins 46,47 on the brackets 48, 49 to the fixed block31in the same manner as has been indicated with reference to roller 38.The film after passing over the last roller is wound` on the other ofthe reels 1 5. j j j j y j In actual operation, the waxing ofthefilms isaccomplished bypassing the margin of the film under the tallow orparaffin candle sections37 and then turning either of the handles 16 towind the newfilm from onereel to the other while beingsubjected tothewaxn ing process indicated. By thismethod,fthe ywaxing can beaccomplished expeditiously and with a vminimum of' effort and material.Conventional tallow .ory paraffin candles of approximatelythree-quarters of an inch in diameter are employed, but ofcourse anysuitable wax substitutes forthe-candle may be employed. v

-As is well known, itis essential to wax the margin ofa cinematographfilm since if this is not done, atk the rst projection there-of, it willbe vfound in the majority of instances that the new film will eithertear or adhere to some part of the projector, particularly the guidestherein. Should the film stick in this .manner during actual projection,the intense heat 10o generated by the arc illuminators used will likelycause the ignition and possible destruc tion of the film while thecontinuity of the scenario is seriously disrupted. The method heretoforein vogue has been to Subj ect the new lm to an oiling at the marginsthereof, this being accomplished by the operator, by

'a cloth moistened with oil passed manually over the margins of the newfilm. This meth-Y od was not only inconvenient but 'frequentlyoccasioned the blurring andfogging of long sections of the film by theoil overrunning the margins into the central portions of the film.` Bythe present methodl have found the two sections of candle illustrated tobe sufficient for lwaxing four vor 'five films before bringing a newsurfaceof they candles in contact with the film to be treated, which isdone by loosening the :wing nuts 29, 30 and sliding `back the movableblock 22 thereby vreleasing the candle sections which may be turned ltopresent new surfaces to the margin of the film. As theprice of thecandles used is nominal, it will be seen that the method is not onlyefficient,fbut also economical.` f

I have described and illustrated merely a preferred form of myinvention, since it will be obvious to those skilled in the art to whichthis invention appertains that various changes and modifications may bemade in the structure thereof without departing from the spirit orsacrificing any of the advantages of' the Vinvention as defined .by theappended claims.

Having described my invention, what l claim as new and desire to securebyLetters Patent is:

v1. A cinematograph film treating device comprising, in combination, abase, a sup,- porting plate on said base, a pair of blocks on saidsupporting plate, a pair of film guiding rollers mountedon-said blocks,one of said blocks being slidably adjustable` relative to said plate,the other of said blocks being fixedly secured on the said plate, bothof said blocksfhaving concaved edges wherebywhen said adjustable blockis moved, a waxing material may be optionally released and clampedbetween said blocks, while one of said pair of film guiding rollers issimultaneously moved, vcausing an alteration rin the degree of tensionwith which a film is applied to said waxing material.

2. A' cinematograph film treating device,

comprising` a plurality of film winding reels,

a supporting plate, blocks on` said plate, one block being adjustablewith respect to another, said blocks having "recessed meeting portionsto clampingly receive a waxing substance'tlierebetween, and filmvguiding and confining rollers vmounted on :said lblocks whereby saidVguiding and confining rollers are simultaneously ladj ustedawith saidblocks to maintain a definite degree of tensionwth which a film isapplied to the waxing substance.

3. A cinematograph film treating device, comprising a pair of blocks,one of which is adjustable relative to the other, a pair of film guidingand retaining rollers mounted on said blocks, and a pair of candlesections clampingly secured between the meeting portions of said blockswhereby said candle sections maybe moved and turned to new-surfacestothe margins of a film held in engagement therewith between said filmguidingr and retaining rollers.

4. A cinematograph film waxing device, comprising a'base, a pair` offilm winding reels on said base, a supporting plate on said base betweensaid winding reels, ka pair of blocks mounted on said plate, one of saidblocks being slidably adjustable relative to the other, said blockshaving concaved meeting edges to clampingly receive candle sec-Y tionstherebetween, candle sections accordingly received between said blocksand en gageable with the margins of a film, said candle sections beingmovable and turnable af.

for adjustment, and film guiding and retaining rollers mounted on saidblock whereby to hold the film in engagement with said candle sectionsand being adjustable simultaneously with the adjusting of said blocks.

In testimony whereof I have signed my nameto this specification.

JOSEPH W. DUNN.

present

